The weird thing is that 3840 × 2160 is not actually true 4K, even though every single "4K" monitor use that resolution. 3840 × 2160 is UHD (Ultra High Definition), but people (including me) say 4K instead because UHD sounds too similar to HD. So people get a bit confused.I think 4096 x 2180 is the standard for cinemas.So basically:4096 x 2180 = Cinema 4K3840 x 2180 = Consumer "4K"